Russia has practiced delivering a retaliatory nuclear strike

[Kurokage]

This is just another one of Putin's "Red Lines".

M.A.D remains a big thing.

We should always stand up to bullies.

This is all just impotent willy waving.

I tend to agree with you, Putin had done nothing but threaten Nuclear Attack since his invasion of Ukraine in attempts to deter any support of Ukraine in defending itself. If we did nothing then we'd be opening a can of worms for other countries in their quest for domination in areas of the world in dispute, the China sea and an independant Taiwan spring to mind.